JPH11115045A - Method and device for forming film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film forming method and a device thereof for winding a film correctly and easily at all times without winding too loosely or too tightly the inflation formed film on a take-up roll. SOLUTION: A roll control means 26 for controlling the rotation of intermediate pinch rolls 19A and 19B and a take-up roll 17 so as to set the tension of a film F traveling on a film traveling line from a take-up pinch roll 17 to a take-up roll 21 within the given set value is formed, and the tension of the film F traveling from the take-up pinch roll 17 to the take-up roll 21 is controlled so that the elongation of the film F is within the range of 0.2-0.5%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a film, and more particularly to a method for winding an inflation-molded film onto a take-up roll without excessively looseness and without excessively tightness. To a method and apparatus for forming a film.

[0002]

2. Description of the Related Art Conventionally, a tubular resin is formed by inflation molding in which a raw material resin such as a thermoplastic resin is melted in a heating cylinder of an extruder, extruded from a die by a screw, blown up and stretched biaxially. Is formed continuously, and at least one of the tube-shaped films is taken in a folded state by a take-off pinch roll composed of a pair of rolls driven to rotate at least one of them, and then is sent out from the take-out pinch roll. Forming a film on a take-up roll rotatable via at least one intermediate pinch roll composed of a pair of rolls at least one of which is rotatably disposed along a predetermined film traveling path. Methods and devices are known.

FIG. 7 shows an example of a film forming apparatus using this kind of conventional film forming method. In the conventional film forming apparatus 1, a hopper attached to the upper surface of an extruder 2 is shown. The raw material resin R supplied from 3 into the heating cylinder 4 of the extruder 2 is melted inside the heating cylinder 4, and is heated by a screw 6 rotated by a driving force of a driving source 5 such as a motor. The resin 4 is conveyed through the inside of the heating cylinder 4, passes through a head portion 7 and a joint portion 8 provided at the tip of the heating cylinder 4, and is extruded in a tube shape from a resin discharge port 10 of a die 9.

[0004] The molten raw resin R extruded from the die 9 is supplied from the compressor 11 to the resin discharge port 10.
The air blown and expanded in the biaxial direction by air or the like supplied to the inside through an air discharge port 12 provided inside, and is formed in an annular shape from a cooling blower 13 through a branch pipe 14. The film F is cooled by a cooling medium such as air supplied to the ring 15 to form a thin tubular film F. Then, this tubular film F
The pair of rolls 17a, 1
The sheet is taken up by being pinched by a pinch roll 17 made of 7a and flattened into a folded state. This take-off pinch roll 17 is
Thus, at least one of the rolls 17a can be driven to rotate, and the take-up speed of the flattened film F can be changed by changing the rotation speed of the motor 18.

[0005] The flattened film F picked up by the picking pinch roll 17 has at least one pair of rolls 19a, 19a arranged along a predetermined film running path, for example, as shown in FIG. As shown in the drawing, the sheet is guided by two intermediate pinch rolls 19A and 19B and a rotatable guide roll 20, and is wound into a roll by a take-up roll 21.

The respective intermediate pinch rolls 19A, 19B
Is that at least one of the rolls 19a can be driven to rotate by the motors 22A and 22B, and the take-up speed of the film F is changed by changing the rotation speed of the motors 22A and 22B. The tension can be variably controlled.
The take-up roll 21 is rotatable and driven by a take-up motor 23, and changes the take-up speed of the film F by changing the rotational speed of the take-up motor 23 to reduce the tension of the film F traveling. It can be variably controlled.

[0007] As another example of a film forming apparatus using a conventional film forming method, a film F flattened by a take-off pinch roll 17 into a folded state is provided just before a take-up roll 21. For example, two sheets of film F are cut out from a fold by a known cutting means (not shown) to form two sheets of film F.
There is known a configuration in which each of the rolls is wound around a winding roll 21 of a book.

[0008]

However, in the conventional film forming apparatus 1 described above, the tension T between the parts of the film F traveling on the film traveling path from the take-off pinch roll 17 to the take-up roll 21 is considered.
In order to set 1, T2, and T3, the operator operated the rotation speed of each of the intermediate pinch rolls 19A and 19B and the winding roll 21. For this reason, the take-off pinch roll 1
7, the tensions T1, T2 between the parts of the film F traveling on the film traveling path from the winding roll 21 to the winding roll 21.
Setting all T3, that is, adjusting the rotation speeds of all the intermediate pinch rolls 19A and 19B and the take-up roll 21, requires a great deal of labor and time.
There is a problem that the skill of the worker is required.

Further, each of the intermediate pinch rolls 19A, 19B
In addition, since the rotation speed of the take-up roll 21 is manually adjusted based on experience, there is a variation in tension adjustment, and the film F is loosely or tightly wound on the take-up roll 21 and is always properly adjusted. There was a problem that it could not be wound.

Therefore, the film F formed by inflation molding is not excessively loosened on the take-up roll 21, and
There has been a demand for a film forming method and a film forming apparatus that can always be appropriately and easily wound without being too tight.

The present invention has been made in view of these points, and it is possible to always properly and easily wind an inflation-molded film on a take-up roll without being too loose and not too tight. An object of the present invention is to provide a method and an apparatus for forming a film.

[0012]

In order to achieve the above-mentioned object, the present inventors have always made it possible to properly and easily apply a blown film to a take-up roll without being too loose and too tight. As a result of intensive research to obtain a film forming method and apparatus that can be wound, the tension of the film traveling on the film traveling path from the take-off pinch roll to the take-up roll is controlled based on the elongation of the film. Or at least the take-up roll and the take-up roll based on the tension of the film traveling between the take-out pinch roll and the intermediate pinch roll adjacent to the downstream side of the film travel path of the take-up pinch roll. Tension between the film and the intermediate pinch roll adjacent to the upstream side of the film running path By controlling, it found that it is possible to always properly and easily winding the inflation molded film to the take-up roll, and completed the present invention.

That is, a feature of the film forming method according to the present invention described in claim 1 is that the tension of the film traveling on the film traveling path from the take-up pinch roll to the take-up roll is determined by elongating the film. Is 0.2
The point is that control is performed so as to fall within the range of 0.5%. By adopting such a configuration, the blown film can always be appropriately and easily wound on the take-up roll. That is, since the proper tension of the running film can be calculated based on the elongation of the film, the tension of the running film can be automatically controlled. The range of the elongation of the film is optimally in the range of # to #%, preferably in the range of # to #%, and particularly preferably in the range of 0.2 to 0.5%. If it is smaller than this range, the film wound on the take-up roll becomes fuzzy, and if it is larger than this range, the film wound on the take-up roll becomes close. Further, the Young's modulus of the film raw material is set to E (Kg / m
m ² ), width is W (mm), thickness is t (mm), and elongation is δ
(%), When the temperature correction value is k, an appropriate tension T is E × W × t × δ × k (where 0.2 ≦ δ ≦ 0.
It can be calculated by 5).

The film forming method according to the present invention described in claim 2 is characterized in that a take-out pinch roll and an intermediate pinch roll adjacent to the take-down pinch roll on the downstream side of the film traveling path. The tension of the film between at least the take-up roll and the intermediate pinch roll adjacent to the upstream of the film traveling path of the take-up roll is detected based on the detection result. The point is to control. And
By adopting such a configuration, the film inflation-molded by the operator can always be appropriately and easily wound around the take-up roll. That is, the tension detecting means for detecting the tension of the film traveling on the film traveling path from the take-up pinch roll to the take-up roll is provided, and the take-out pinch roll and the downstream side of the film travel path of the take-up pinch roll are provided. Based on the tension of the film traveling between the adjacent pinch rolls, the tension at other points can be easily controlled automatically or manually by an operator.

A feature of the film forming method according to the present invention described in claim 3 is that, in claim 1 or 2, the film is cut into two sheets, and each sheet is cut. Is wound up on two winding rolls. And by adopting such a configuration, a tubular film formed by inflation molding can be wound up as a sheet-like film.

A feature of the film forming apparatus according to the present invention is that the tension of the film traveling on the film traveling path from the take-up pinch roll to the take-up roll is set to a predetermined set value. And roll control means capable of controlling the rotation of the intermediate pinch roll and the take-up roll so as to fall within the range. By adopting such a configuration, the film forming method according to claim 1, that is, the tension of the film traveling on the film traveling path from the take-up pinch roll to the take-up roll is reduced, and the elongation of the film is reduced to zero. It can be controlled to be in the range of 0.2 to 0.5%. Further, the tension of the film can be easily and automatically controlled by controlling the rotation of the intermediate pinch roll and the take-up roll by the roll control means. It can always be appropriately and easily wound around the take-up roll.

According to a fifth aspect of the present invention, there is provided a film forming apparatus according to the fourth aspect of the present invention, wherein the roll control means includes at least a Young's modulus, a width, a thickness and an elongation of a raw material of the film. And the input device to which the temperature correction value is input, the Young's modulus of the raw material of the film input by the input device is E (Kg / mm ² ), the width is W (mm), the thickness is t (mm), and the elongation is δ (%), when the temperature correction value is k, the appropriate tension T is E × W × t × δ × k
(Where 0.2 ≦ δ ≦ 0.5) and a controller that controls the rotation of the intermediate pinch roll and the take-up roll so that the tension is appropriately calculated by the arithmetic unit. It is in. By adopting such a configuration, the blown film can always be appropriately and more easily wound around the take-up roll.

The film forming apparatus according to the present invention described in claim 6 is characterized in that a pinch roll for taking out of a film traveling path from a pinch roll for taking up to a take-up roll, and the take-up pinch roll. Leading-side tension detection means for detecting the tension of the film traveling between the pinch roll and the intermediate pinch roll adjacent to the downstream side of the film travel path, and a film travel path from the take-up pinch roll to the take-up roll Tail tension detecting means for detecting the tension of the film traveling between the take-up roll and the intermediate pinch roll adjacent to the upstream of the film travel path of the take-up roll, and leading-side tension detection Controlling the rotation of the intermediate pinch roll and the take-up roll according to the film tension detected by the means In that it has at least the end side tension detection means capable of controlling the tension of the film is detected by the roll control means by the. And
By adopting such a configuration, the film forming method according to claim 2, that is, between the take-out pinch roll and the intermediate pinch roll adjacent to the downstream side of the film running path of the take-up pinch roll. Detecting the tension of the running film, and controlling the film tension at least between the take-up roll and the intermediate pinch roll adjacent to the upstream of the film traveling path of the take-up roll based on the detection result. It is possible to automatically or manually adjust the tension at other points based on the tension of the film traveling between the take-out pinch roll and the intermediate pinch roll adjacent to the downstream side of the film travel path of the take-up pinch roll. Can be easily controlled by the operator, and as a result, the blown film It is possible to always properly and easily wound around the take-up roll.

The film forming apparatus of the present invention described in claim 7 is characterized in that, in claim 6, the roll control means detects at least the leading tension detecting means and the trailing tension detecting means. And a controller that controls the rotation of the intermediate pinch roll and the take-up roll such that the comparison result obtained by the comparison unit falls within a range of a preset set value. It is in. By adopting such a configuration, the blown film can always be appropriately and more easily wound around the take-up roll.

The film forming apparatus according to the present invention described in claim 8 is characterized in that, in any one of claims 4 to 7, the film is cut into two sheets. In order to obtain the above film, there is provided a cutting means disposed on the upstream side of the film traveling path of the winding roll, and two winding rolls for winding the sheet-like film. And by adopting such a configuration, the film forming method according to claim 3, that is,
Since the film is cut into two sheets and each sheet-like film can be wound on two winding rolls, the inflation-molded tube-like film can be wound as a sheet-like film. it can.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIGS. 1 and 2 show a first embodiment of a film forming apparatus according to the present invention using the film forming method according to the present invention. FIG. 1 is a schematic structural view of a main part. 2 is a block diagram showing a configuration of the roll control means. The same or corresponding components as those of the above-described conventional device will be described by attaching the same reference numerals in the drawings.

As shown in FIG. 1, the film forming apparatus 25 according to the present embodiment has an extruder 2.
Is provided with a heating cylinder 4 for melting the raw material resin R. Inside the heating cylinder 4, a screw 6 for transporting the raw material resin R is provided.
The screw 6 is rotatable with the driving force of a driving source 5 such as a motor disposed on the right side in FIG. That is, by rotating the screw 6 with the driving force of the drive source 5, the raw resin R is transported from the right to the left in FIG. 1, and the raw resin R is transferred by the heating cylinder 4 during the transportation. The raw material resin R which is heated to a predetermined temperature to be in a molten state and is melted to be in a liquid state is extruded from the tip of the heating cylinder 4. A hopper 3 is attached to the upper surface of the heating cylinder 4 near the rear end shown on the right side in FIG. 1 as raw material supply means for supplying the raw material resin R into the inside of the heating cylinder 4. .

At the tip of the heating cylinder 4 of the extruder 2, a head 7 for guiding the molten raw material resin R upward is provided. Is provided with a die 9 via a joint portion 8. The die 9 is provided with a resin discharge port 10 formed in a substantially annular shape in a plane for extruding the raw material resin R in a molten state into a tube shape. The die 9 is provided with an air discharge port 12 inside the resin discharge port 10. As is well known, the air discharge port 12 discharges the air supplied from the compressor 11 into the molten raw material resin R discharged in a tubular shape from the resin discharge port 10 and extends in the biaxial direction. This is for forming a thin tubular film F.

Above the die 9, an air ring formed in a substantially annular shape to cool the tubular film F by discharging a cooling medium such as air toward the outer peripheral surface of the tubular film F. A cooling medium 15 such as air is supplied from the cooling blower 13 to the air ring 15 via the branch pipe 14.

Further above the die 9, a stabilizer 16 is provided.
Is disposed above the pair of rolls 17.
A take-off pinch roll 17 composed of a and 17a is provided. The take-off pinch roll 17 is for flattening the film F, which has been cooled and formed into a thin-film tubular shape, so that the film F is sandwiched between the rolls. At least one of the rolls 17a is rotatably driven by a motor 18, and the rotation speed of the motor 18 is changed by control means (not shown), so that the take-off pinch roll 17 is rotated.
The take-up speed of the film F can be controlled by changing the rotation speed of the film F.

Then, the flattened film F picked up by the picking pinch roll 17 is formed by a pair of rolls 19a, 19a arranged along the film running path.
At least one, in this embodiment, two intermediate pinch rolls 19A and 19B and a rotatable guide roll 20 are wound around a winding roll 21 in a roll form.

At least one roll 19a of the pair of rolls 19a constituting the intermediate pinch rolls 19A, 19B is rotatable by motors 22A, 22B, respectively. The motors 22A and 22B are electrically connected to a roll control unit 26 described later, and independently control the rotation speeds of the motors 22A and 22B based on a control command sent from the roll control unit 26. The traveling speed and the tension T1 of the film F traveling between the take-off pinch roll 17 and the intermediate pinch roll 19A, and the traveling speed and the tension T1 of the film F traveling between the intermediate pinch rolls 19A and 19B are changed. The tension T2 can be controlled.

The winding roll 21 is provided with a winding motor 2
3 enables rotation. The take-up motor 23 is electrically connected to a roll control means 26 to be described later, and changes the rotation speed of the take-up motor 23 based on a control command sent from the roll control means 26 to thereby provide an intermediate drive. The traveling speed and tension T3 of the film F traveling between the pinch roll 19B and the take-up roll 21 can be controlled.

As shown in FIG. 2, the roll control means 26 includes at least a CPU 27, a ROM having an appropriate capacity,
The roll control means 26 includes a memory 28 formed of a RAM or the like, and a controller 29 for independently driving the rotation speed of each of the motors 22A and 22B and the winding motor 23. An input device 30 including at least a touch panel and a keyboard for inputting various setting values is connected.

From the input device 30, at least the Young's modulus, width, thickness, elongation and temperature correction value of the raw material of the film F to be produced are inputted as set values and stored in the input data storage section 31 of the memory 28. . At this time, the value of the Young's modulus of the raw material is not directly input from the input device 30, but a numerical raw material code indicating the raw material is input. When the raw material code is input, the Young's modulus of the raw material previously recorded in the data storage area (not shown) of the memory 28 in the form of a conversion table or the like is stored in the input data storage unit 3.
1 is stored. In addition, the temperature correction value is not directly input from the input device 30,
For example, it is input as room temperature. When the room temperature is input, a temperature correction value previously recorded in a data storage area (not shown) of the memory 28 is stored in the input data storage unit 31 in the form of a conversion table or the like according to the raw material code. ing. Further, the Young's modulus and the temperature correction value of the raw material can be obtained in advance by experiments, simulations, and the like.

The memory 28 has a Young's modulus E (Kg / mm ² ) and a width W (m) of the raw material of the film F input from the input device 30 and stored in the input data storage unit 31.
m), thickness t (mm), elongation δ (%), and temperature correction value k, the appropriate tension T of running film F is expressed by E × W ×
An arithmetic means 32 is provided which stores a program for calculating t × δ × k (where 0.2 ≦ δ ≦ 0.5).

In the memory 28, the rotational speed (rotation speed) of each of the intermediate pinch rolls 19A and 19B and the winding roll 21 required to obtain the tension T calculated by the calculating means 32 is calculated. And the intermediate pinch rolls 19A and 19B calculated by the motor control program.
The rotation speed of the winding roll 21 and the like are stored in the output data storage unit 33 of the memory 28 as control data. When the device is operating, the output data storage unit 33
The controller 2 based on the control data stored in the controller 2
9 controls the motors 22A, 22B and the take-up motor 23 so that the intermediate pinch rolls 19A, 19B and the rotation of the take-up rolls are adjusted so that the tensions T1, T2, T3 of the running film F are appropriate. The speed is controlled.

Next, the operation of the present embodiment having the above-described configuration will be described.

When the film F is formed by the film forming apparatus 25 of the present embodiment, first, before starting production of the film F, the input device 30 first inputs the raw material code, width, Enter thickness, elongation and room temperature as set values. Then, the Young's modulus, width, thickness, elongation, and temperature correction value of the raw material are stored in the input data storage unit 31 of the roll control unit 26 as data. Then, based on these data, the calculating means 32 calculates the appropriate tension T of the running film F as E × W × t × δ ×
k (however, 0.2 ≦ δ ≦ 0.5). When the calculating means 32 calculates the tension T, the motor control program stored in the memory 28
The motors 22A and 22B and the winding motor 23 required to obtain the rotation speeds (number of rotations) of the intermediate pinch rolls 19A and 19B and the winding roll 21 required to obtain the tension T calculated in Step 2 Is calculated and stored in the output data storage unit 33 as control data.

That is, in the present embodiment, the take-out pinch roll 17 and the intermediate pinch roll 19 located adjacent to the take-down pinch roll 17 on the downstream side of the film traveling path.
A, a tension T1 of the film F traveling between the two intermediate pinch rolls 19A, 19B, a winding roll 21, and an upstream side of a film traveling path of the winding roll 21. The tension T3 of the film F running between the intermediate pinch rolls 19B adjacent to the film T is automatically given the appropriate value of the tension T calculated by the calculating means 32.

Next, the film forming apparatus 2 of the present embodiment
5 operates, the hopper 3 attached to the upper surface of the extruder 2
Is fed into the heating cylinder 4 of the extruder 2 from the heating cylinder 4 and melted inside the heating cylinder 4, and the heating resin 4 is rotated by a screw 6 rotated by a driving force of a driving source 5 such as a motor. And is extruded into a tube shape from the resin discharge port 10 of the die 9 through the head portion 7 and the joint portion 8 provided at the tip of the heating cylinder 4. Then, the molten raw material resin R extruded from the die 9 is supplied to the compressor 1
1 to the air discharge port 1 provided inside the resin discharge port 10
The air blows and expands in the biaxial direction by air or the like supplied to the inside through the pipe 2, and the air supplied from the cooling blower 13 to the annularly formed air ring 15 through the branch pipe 14. The film is cooled by a cooling medium to form a thin tubular film F. Thereafter, the tubular film F is regulated by the stabilizing plate 16 and is flattened by being picked up by being pinched by the picking pinch roll 17 to be folded into two. Then, the flattened film F picked up by the picking-up pinch roll 17 is provided with two intermediate pinch rolls 19A and 19B arranged along the film running path, and
It is guided by a rotatable guide roll 20 and wound up in a roll shape by a winding roll 21.

At this time, each intermediate pinch roll 19A, 19
B and the winding motor 23 for driving the winding roll 21 are controlled by the controller 29 based on the control data stored in the output data recording section of the roll control means 26. As a result, the tensions T1, T2, T3 of the running film F
Is set to the calculated appropriate tension T, the intermediate pinch rolls 19A and 19B and the winding roll 21
The rotation speed of each is controlled independently and automatically.

Therefore, in this embodiment, the take-up pinch roll 17 and the take-up roll 21
Tension T1, T2, and T3 of the film F traveling on the film traveling route to the film traveling route can be appropriately and automatically applied, so that the inflation-molded film F is not excessively loosened on the take-up roll 21 and too tight. It is possible to always wind the wire properly and easily.

In this embodiment, the room temperature for setting the temperature correction value is input before the apparatus is operated. However, the room temperature changes with the time of day and the operation time of the apparatus. Alternatively, the appropriate tension T of the running film F may be sequentially changed by inputting the room temperature to the roll control means 26 in accordance with the change in the room temperature.

The temperature of the running film F is detected in real time by a temperature sensor (not shown), and the detected temperature of the film F is automatically input to the roll control means 26 instead of the room temperature. Is controlled so that the appropriate tension T of the running film F can be sequentially changed, that is, the rotation speed of each of the intermediate pinch rolls 19A and 19B and the winding roll 21 is continuously changed according to the temperature of the film F. It is more preferable that the film F formed by inflation molding is properly wound by the winding roll 21.

FIG. 3 shows a main part of a second embodiment of the film forming apparatus according to the present invention using the film forming method according to the present invention.
A is a flattened film F which is cut and cut into two sheets, and each sheet-like film F is wound on two winding rolls 21 and 21, respectively. In the film forming apparatus 25A of the embodiment, two winding rolls 21 are provided,
On the upstream side of the film running path of these winding rolls 21 and 21, a flattened and folded film F is provided.
A known incision means 40 for incising into two pieces along the fold is provided.

In the present embodiment, the film F is flattened at a position beyond the intermediate roll 19B, and the folded film F is divided into two sheet films F.
The roll control means 26A includes between the take-out pinch roll 17 and an intermediate pinch roll 19A adjacent to the take-down pinch roll 17 on the downstream side of the film traveling path, and
Appropriate tension T calculated by the calculating means 32 is applied between the two intermediate pinch rolls 19A and 19B, so that the winding rolls 21 and 21 and the winding rolls 21 and 21 are located on the upstream side of the film traveling path. A program for giving 1/2 of the proper tension T calculated by the calculating means 32 is stored between the intermediate pinch rolls 19B.

The other structure is the same as that of the first embodiment.

With such a configuration, the film forming apparatus 25A of the present embodiment allows the pinch roll 17 between the take-up pinch roll 17 and the intermediate pinch roll 19A adjacent to the take-down pinch roll 17 to be located downstream of the film traveling path. The tension T1 of the running film F and the two intermediate pinch rolls 19
A, tension T2 of film F running between 19B
Means that E × W × t × δ × k (however,
An appropriate value of the tension T calculated according to (0.2 ≦ δ ≦ 0.5) is automatically given.

The tension T3 of the film F traveling between the winding rolls 21 and 21 and the intermediate pinch roll 19B adjacent to the upstream of the film traveling path of the winding rolls 21 and 21 is calculated. Means 32 automatically give a value of の of the appropriate tension T value calculated by E × W × t × δ × k (where 0.2 ≦ δ ≦ 0.5).

Therefore, according to the film forming apparatus 25A of this embodiment, the same effects as those of the first embodiment can be obtained, and the inflation-molded tube-like film F can be appropriately and easily wound as a sheet-like film. be able to.

FIGS. 4 and 5 show a main part of a film forming apparatus according to a third embodiment of the present invention using the film forming method according to the present invention. It travels between the take-out pinch roll 17 of the film travel path from the take-up pinch roll 17 to the take-up roll 21 and the intermediate pinch roll 19A adjacent to the take-away pinch roll 17 on the downstream side of the film travel path. A leading-side tension detecting means 44 comprising a tension pickup for detecting the tension T1 of the film to be applied is provided. Further, the winding roll 21 of the film traveling path from the take-up pinch roll 17 to the winding roll 21 and the intermediate pinch roll 19 adjacent to the upstream side of the film traveling path of the winding roll 21.
A trailing-side tension detecting means 45 comprising a tension pickup for detecting the tension T3 of the film traveling between B and B is provided. The leading-side tension detecting unit 44 and the trailing-side tension detecting unit 45 are electrically connected to the roll control unit 26B, and can send detection results of the tensions T1 and T3 to the roll control unit 26B. It has become.

As shown in FIG. 5, the roll control means 26B comprises at least a CPU 27B and an RO of an appropriate capacity.
M, a memory 28B formed of a RAM, and the like, and a controller 29B for independently driving the rotation speeds of the motor 22B and the winding motor 23.

The memory 28 compares the tensions T1 and T3 of the film F detected by the leading tension detecting means 44 and the trailing tension detecting means 45 so that the tension T1 and the tension T3 are the same. The motor 22 controls the rotation speed (rotation speed) of the intermediate pinch roll 19B and the take-up roll 21.
B and a motor operation control unit 48 in which a program for obtaining control data for controlling the take-up motor 23 is stored. When the apparatus is operating, the controller 29 controls the motor 22B and the winding device in accordance with the control data of the motor operation control unit 48. By controlling the take-up motor 23, the rotation speeds of the intermediate pinch roll 19B and the take-up roll 21 are automatically controlled so that the tensions T1 and T3 of the film F become the same.

The other configuration is the same as that of the first embodiment.

According to the film forming apparatus 25B of the present embodiment having such a configuration, the operator can move the intermediate pinch roll 19
By manipulating the rotation speed of A, the take-out pinch roll 17 is located on the downstream side of the take-out pinch roll 17 of the film travel path from the take-up pinch roll 17 to the take-up roll 21 by operating the rotation speed of A. The tension T1 between the intermediate roll 19A and the intermediate roll 19A is appropriate.
Is set to Then, the value of the tension T1 is detected by the leading-side tension detection means 44 and sent to the roll control means 26B. Also, the winding roll 21 of the film traveling path from the take-up pinch roll 17 to the winding roll 21 and the intermediate pinch roll 19B adjacent to the upstream side of the film traveling path of the winding roll 21.
Is automatically detected by the trailing-side tension detecting means 45, and the value of the tension T3 is sent to the roll control means 26B.

Next, in the motor operation control section 48 of the roll control means 26B, the leading side tension detection means 44
And the tension T3 detected by the tail-side tension detecting means 45.
And the motor 22B and the winding motor 23 are controlled so as to control the rotation speed (number of rotations) of the intermediate pinch roll 19B and the winding roll 21 so that the tension T1 and the tension T3 are the same. Control data to be controlled is formed, and the controller 29 controls the motor 22B and the take-up motor 23 based on the control data.
The rotation speeds of the intermediate pinch roll 19B and the take-up roll 21 are automatically controlled so as to be the same.

Therefore, according to the film forming apparatus 25B of the present embodiment, the operator performs a simple operation of setting only the tension T1 to an appropriate tension T, thereby moving the take-up pinch roll 17 from the take-up roll 21 to the take-up roll 21.
Automatically set all the tensions T2 and T3 of the remaining portions of the film F traveling on the film traveling route to
That is, by setting the rotation speed of the intermediate pinch roll 19A, the rotation speeds of the intermediate pinch roll 19B and the take-up roll 21 can be automatically and appropriately adjusted. The tension T1, T2, and T3 of the film F traveling on the film traveling route up to 21 can be adjusted in a short time by an unskilled worker without any variation in the tension adjustment. The rolled film F can be always properly and easily wound on the take-up roll 21 without being too loose and not too tight.

As shown by a dashed line in FIG. 4, an intermediate tension detecting means 46 comprising a tension pickup for detecting the tension T2 of the film F running between the intermediate pinch rolls 19A and 19B may be provided. Good.

Further, when there are three or more intermediate pinch rolls, a structure may be provided in which tension detecting means comprising a tension pickup is provided between the intermediate pinch rolls adjacent to each other.

Further, according to the necessity of the design concept or the like, the values of the tensions T1 and T3 detected by the leading-side tension detecting means 44 and the trailing-side tension detecting means 45 can be monitored without using the roll control means 26B. And the operator may adjust the rotation speeds of the intermediate pinch roll 19B and the take-up roll 21 so that the tensions T1 and T3 displayed on the display unit are the same. And, with such a configuration, although operation by an operator is required,
An unskilled worker can always properly and easily wind the blown film F on the take-up roll 21 without being too loose and not too tight. In addition, such a configuration can be easily applied to the existing conventional film forming apparatus 1.

FIG. 6 shows a main part of a film forming apparatus according to a fourth embodiment of the present invention using the film forming method according to the present invention.
C is to flatten and cut the film F in a folded state into two sheets, and to wind each sheet-like film F on two winding rolls 21 and 21, respectively. In the film forming apparatus 25C of the embodiment, two winding rolls 21 are provided,
On the upstream side of the film running path of these winding rolls 21 and 21, a flattened and folded film F is provided.
A known incision means 40 for incising into two pieces along the fold is provided.

Further, in the present embodiment, since the film F which is flattened at the position beyond the intermediate roll 19B and is folded in two is divided into two sheet-like films F,
Two tail-side tension detecting means 45 for detecting the tensions T3, T3 of the film F running between the intermediate pinch roll 19B and each of the winding rolls 21, 21 are provided. Is the value of the appropriate tension T of the tension T1 detected by the leading-side tension detecting means 44 and the tension T detected by each of the trailing-side tension detecting means 45, 45.
3, and the value of T3 are compared, and an appropriate tension T (T1
= T), the motor 22B and each winding are controlled so as to control the rotation speed (rotation speed) of the intermediate pinch roll 19B and each of the winding rolls 21 and 21 so that the value of each tension T3 and T3 becomes に 対 し て with respect to T. Control data for controlling the take-up motors 23, 23 is formed, and a controller (not shown) controls the motor 22B and the respective take-up motors 23, 23 based on the control data. Is 1 /
2, the rotation speeds of the intermediate pinch roll 19B and the winding rolls 21 and 21 are automatically controlled.

The other structure is the same as that of the third embodiment.

With such a configuration, the film forming apparatus 25C of the present embodiment exhibits the same effects as the third embodiment, and appropriately and easily converts the inflation-molded tube-like film into a sheet-like film F. Can be wound up.

When there are three or more intermediate pinch rolls, it is preferable to provide a tension detecting means comprising a tension pickup between the intermediate pinch rolls adjacent to each other.

If necessary, such as a design concept, the roll tension control means 26C is not provided, and the front tension detection means 44 and the rear tension detection means 4 are provided.
Tensions T1, T3, T3 detected by 5, 45
Is displayed on a display means such as a monitor, and the operator operates the intermediate pinch roll 19B so that the tensions T3 and T3 displayed on the display means are の of the tension T1.
Alternatively, the rotation speed of each of the winding rolls 21 and 21 may be adjusted.

The present invention is not limited to the above embodiments, but can be variously modified as needed.

[0065]

As described above, according to the film forming method and apparatus of the present invention, the inflation-molded film F is always properly and easily made without being too loose and too tight on the take-up roll. It has an extremely excellent effect that it can be wound.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a first embodiment of a film forming apparatus according to the present invention using a film forming method according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a roll control unit in FIG. 1;

FIG. 3 is a view similar to FIG. 1 showing a main part of a second embodiment of the film forming apparatus according to the present invention using the film forming method according to the present invention;

FIG. 4 is a view similar to FIG. 1 showing a main part of a third embodiment of a film forming apparatus according to the present invention using the film forming method according to the present invention;

FIG. 5 is a view similar to FIG. 2, showing the configuration of the roll control means of FIG. 4;

FIG. 6 is a view similar to FIG. 1 showing a main part of a fourth embodiment of the film forming apparatus according to the present invention using the film forming method according to the present invention;

FIG. 7 is a schematic configuration diagram showing a main part of an example of a conventional film forming apparatus using a conventional film forming method.

[Explanation of symbols]

 Reference Signs List 2 extruder 3 hopper 4 heating cylinder 6 screw 9 die 10 resin discharge port 12 air discharge port 15 air ring 16 stabilizer 17 take-off pinch roll 17a (constituting take-off pinch roll) roll 18 (of take-off pinch roll) Motor 19A, 19B Intermediate pinch roll 19a Roll (constituting intermediate pinch roll) 20 Guide roll 21 Take-up roll 22A, 22B (of intermediate pinch roll) Motor 23 Take-up motor 25, 25A, 25B, 25C Film manufacturing device 26, 26A, 26B, 26C Roll control means 27, 27B CPU 28 28B Memory 29, 29B Controller 30 Input device 31 Input data storage unit 32 Operation means 33 Output data storage unit 40 Incision means 44 Leading tension detecting means 45 Trailing tension Down detection unit 48 motor operation control unit R raw resin F film T, T1, T2, T3 (film) tension

Claims (8)

[Claims] An inflation-molded tubular film is flattened by a rotatable take-off pinch roll and taken in a folded state, and then the film delivered from the take-up pinch roll is passed through a predetermined film traveling path. A film forming method for winding a film on a take-up roll rotatably driven via at least one intermediate pinch roll rotatably disposed along the film, a film traveling path from the take-up pinch roll to the take-up roll Controlling the tension of the film running on the substrate such that the elongation of the film is in the range of 0.2 to 0.5%. 2. An inflation-molded tube-shaped film is flattened by a rotatable take-off pinch roll and taken in a folded state, and then the film delivered from the take-off pinch roll is fed to a predetermined film running position. A film forming method for winding on a rotatably driven take-up roll via at least one rotatable drivable intermediate pinch roll disposed along a path, wherein the take-off pinch roll and a film traveling of the take-off pinch roll The tension of the film traveling between the intermediate pinch roll adjacent to the downstream side of the path is detected, and based on the detection result, at least the winding roll and the upstream side of the film traveling path of the winding roll. Controlling the tension of the film between the adjacent intermediate pinch roll Film forming method comprising Rukoto. 3. The film according to claim 1, wherein the film is cut into two sheets, and each sheet-like film is wound on two winding rolls. Forming method. 4. A rotatable take-off pinch roll for flattening an inflation-molded tubular film and taking it in a folded state, and a rotatable drive roll for winding up the film delivered from the take-up pinch roll. A take-up roll, and a film forming apparatus having at least one rotatable drivable intermediate pinch roll disposed along a film traveling path from the take-up pinch roll to the take-up roll, wherein: A roll control unit capable of controlling the rotation of the intermediate pinch roll and the winding roll so that the tension of the film traveling on the film traveling route to the winding roll is within a predetermined set value range. Characteristic film forming equipment. 5. An apparatus for inputting at least a Young's modulus, a width, a thickness, an elongation and a temperature correction value of a raw material of the film, the roll control means comprising: When the Young's modulus is E (Kg / mm ² ), the width is W (mm), the thickness is t (mm), the elongation is δ (%), and the temperature correction value is k, the appropriate tension T is E × Calculating means for calculating by W × t × δ × k (however, 0.2 ≦ δ ≦ 0.5); and the intermediate pinch roll and the winding so that the proper tension T calculated by the calculating means is obtained. The film forming apparatus according to claim 4, further comprising a controller that controls rotation of the roll. 6. A rotatable take-off pinch roll for flattening an inflation-molded tubular film and taking it in a folded state, and a rotatable drive roll for winding up the film delivered from the take-up pinch roll. A take-up roll, and a film forming apparatus having at least one rotatable drivable intermediate pinch roll disposed along a film traveling path from the take-up pinch roll to the take-up roll, wherein: The tension of the film traveling between the take-out pinch roll and the intermediate pinch roll located downstream of the film travel path of the take-out pinch roll in the film travel path to the take-up roll is detected. A front-side tension detecting means for performing For detecting the tension of the film traveling between the take-up roll of the film travel path leading to the take-up roll and the intermediate pinch roll adjacent to the upstream of the film travel path of the take-up roll. A trailing-side tension detecting unit, which is detected by at least the trailing-side tension detecting unit by controlling the rotation of the intermediate pinch roll and the winding roll in accordance with the tension of the film detected by the leading-side tension detecting unit. Roll control means capable of controlling the tension of the film. 7. The roll control means includes: a comparison unit that compares each tension detected by at least the leading tension detection unit and the tail tension detection unit; and a comparison result obtained by the comparison unit is set in advance. The film forming apparatus according to claim 6, further comprising: a controller that controls rotation of the intermediate pinch roll and the take-up roll so as to fall within a range of a set value. 8. A cutting means provided on the upstream side of a film running path of the winding roll for cutting the film into two sheet-like films, and a winding means for winding these sheet-like films. The film forming apparatus according to any one of claims 4 to 7, further comprising a book winding roll.